direct or indirect band gap need for semiconductor basically. but insulator always high band gap.
Dear Ranjitha K N
Jeff Gruszynski, wrote an answer in [1] related the question, "Why are direct band gap materials preferred over indirect band gap materials for optical properties?". below I cite the following:
A direct gap semiconductor DOES NOT require a phonon in a photon-to- electron-hole pair generation process so electrooptical devices is very efficient.
An indirect gap semiconductor DOES require a phonon in a photon-to-electro-hole pair generation process.
In the case of light generation, the indirect gap material creates a phonon which is instead emitted and creates heat that must be dissipated. A direct gap semiconductor can generate photons with less heat produced because it doesn’t generate a phonon with each electron-hole photo-recombination.
I hope the above comparison is sufficient for you to decide which one is more important for your application . My best regards ...
[1] https://www.quora.com/Why-are-direct-band-gap-materials-preferred-over-indirect-band-gap-materials-for-optical-properties
In glass which band is important whether direct band or indirect band and why?
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